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Influenza A/H7N9 polymerase symmetric dimer bound to the promoter (PA K289A/C489R)
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 7Z4O
Refinement RMS Deviations Key Refinement Restraint Deviation f_dihedral_angle_d 5.503 f_angle_d 0.766 f_chiral_restr 0.036 f_bond_d 0.007 f_plane_restr 0.004
Sample Influenza A/H7N9 polymerase in replicase-like conformation in pre-initiation state with Pol II pS5 CTD peptide mimic bound in site 1A/2A Sample Components Polymerase acidic protein, RNA-directed RNA polymerase catalytic subunit and Polymerase basic protein 2 51-mer vRNA loop (v51_mut_S)
Specimen Preparation Sample Aggregation State PARTICLE Vitrification Instrument FEI VITROBOT MARK IV Cryogen Name ETHANE Sample Vitrification Details
3D Reconstruction Reconstruction Method SINGLE PARTICLE Number of Particles 278761 Reported Resolution (Å) 3.3 Resolution Method FSC 0.143 CUT-OFF Other Details Refinement Type Symmetry Type POINT
Map-Model Fitting and Refinement Id 1 (7Z4O) Refinement Space REAL Refinement Protocol Refinement Target Overall B Value Fitting Procedure Details
Data Acquisition Detector Type FEI FALCON IV (4k x 4k) Electron Dose (electrons/Å**2) 40
Imaging Experiment 1 Date of Experiment Temperature (Kelvin) Microscope Model TFS GLACIOS Minimum Defocus (nm) 800 Maximum Defocus (nm) 2000 Minimum Tilt Angle (degrees) Maximum Tilt Angle (degrees) Nominal CS 2.7 Imaging Mode BRIGHT FIELD Specimen Holder Model FEI TITAN KRIOS AUTOGRID HOLDER Nominal Magnification Calibrated Magnification Source FIELD EMISSION GUN Acceleration Voltage (kV) 200 Imaging Details
EM Software Task Software Package Version PARTICLE SELECTION cryoSPARC 3.3 IMAGE ACQUISITION EPU CTF CORRECTION cryoSPARC 3.3 MODEL FITTING UCSF Chimera INITIAL EULER ASSIGNMENT cryoSPARC 3.3 FINAL EULER ASSIGNMENT cryoSPARC 4.0 CLASSIFICATION cryoSPARC 4.0 RECONSTRUCTION cryoSPARC 4.0 MODEL REFINEMENT PHENIX
Image Processing CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details PHASE FLIPPING AND AMPLITUDE CORRECTION